Red Hat DIRECTORY SERVER 8.1 - 11-01-2010 Manual do Utilizador descarregar pdf (Página 41)

You can set the level of trust of a particular key by selecting that key and

choosing the option Set Owner Trust from Key Management, or from Key

Properties itself.

You alone decide which level of trust to assign to a key, and the trust is

assigned only locally. This is considered private information: it is not included

with the key when it is exported, and is stored in a separate place from your

keyring.

You should set the trust level of your own key pair to the maximum (I trust

ultimately).

7.7.3. Criteria for key validity

The trust level is used to calculate the validity of a key. Being the trust level

only locally significant, as a consequence the calculated validity of a key is only

relative to your local installation of OpenPGP. That is, a key you consider valid

might be considered invalid by someone else.

A key is considered valid if it has been signed by a fully trusted key, or by at

least 3 marginally trusted keys. In addition to that, the path leading from that

key back from your own key must be 5 steps or shorter.

Note that, as a consequence, keys signed personally by your own key are

always considered valid.

Ultimate trust bypasses any restrictions on how many fully trusted signatures

are needed to make a key valid: any key signed by an ultimately trusted key is

always valid. You can set ultimate trust to a particular key you want to allow to

make trust decisions for you.

You can see the calculated validity and trust value in the Key Management or

Key Properties window, in the fields Key validity and Owner trust.

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Red Hat DIRECTORY SERVER 8.1 - 11-01-2010 Manual do Utilizador Página 41